S
supervaan
Guest
I'm pretty confused about hese particular mole questions. The ones where you find the number of particles right, by multiplying the number of moles by avogadros number.
For exampllee: How many particles are in 5.7mol of NaCl?
I would have calculated it as 5.7 x 6.022 x 10^23
but the answer is 2 x 5.7 x 10^23
Apparently, you have to take in account the formula units?
But the thing is, with H2O, if you were to calcaulate the number of particles in 5.7mol. it would be 5.7 x 6.022 x 10^23.
Someone told me that with ionic substances, you have to take into consideration the formula units, but with covalent substances you treat the molecule as one unit. But I'm not sure.
Is this right? If not, how would you do them?
Sorry; I meant, the answer's 2 x 5.7 x 6.022 x 10^23 for the no. of particles in NaCl
For exampllee: How many particles are in 5.7mol of NaCl?
I would have calculated it as 5.7 x 6.022 x 10^23
but the answer is 2 x 5.7 x 10^23
Apparently, you have to take in account the formula units?
But the thing is, with H2O, if you were to calcaulate the number of particles in 5.7mol. it would be 5.7 x 6.022 x 10^23.
Someone told me that with ionic substances, you have to take into consideration the formula units, but with covalent substances you treat the molecule as one unit. But I'm not sure.
Is this right? If not, how would you do them?
Sorry; I meant, the answer's 2 x 5.7 x 6.022 x 10^23 for the no. of particles in NaCl